Daniel57 I already tried, but it does not move, it is really blocked !
1) When threads are locked against one another, try to compress the two parts towards each other with as much force as you can, while applying the twisting motion. You can try using hard foam on the palm of your hands to get a better grip, and press the camera between two hands, while rotating the palms. This will often help for threads that are roughly machined.
2) try a jar opener like this one:
https://www.amazon.com/Container-Bottle-Opener-Kitchen-Silicon/dp/B07MY1DH87
Use one at the body and the other at the flange. You may need to buy two of them. You may already have them in your kitchen. The silicone ones work best. Get your spouse to try to press the two parts together while you try to twist the parts,
3) try a camera filter extraction tool like this one:
https://www.amazon.com/gp/product/B06ZZLQH7C
Again, use two of them, one against the other. These tend to grip stronger than the jar openers, so try to be gentle.
4) keep the female thread (in this case the body) as warm as you can, and keep the male thread (the flange) as cool as you can. Try powering the camera, and run it at the highest frame rate possible to warm that part up before trying to open the camera.
Chen
